Folate dosage and evidence
Written by Aaron CuhaReviewed Sep 2026
The short answer
B vitamins reliably lower homocysteine. HOPE-2 and NORVIT then showed that lowering it did not prevent the vascular events people wanted. MTHFR is context, not a protocol. Check B12 before you add folate.
- People given it
- 0
- Human studies
- 0
- Found nothing
- 0
Dose
No human dose established
No published study on this page has given this compound to people and reported a result.
2 human studies where nobody was given it
No first-hand reports gathered yet. That is a gap in what we have collected, not a finding that nothing has been reported.
What it has been measured to do
Measured in people
Goals Folate has been measured for in a human being, most people first. Counts come from the study lines on this page and deliberately undercount.
- Heart attacks and strokesno headcount stated · 2 studies · 2 found nothing
35 of the 36 indexed goals have no study of any kind behind Folate
No trial, no animal work, no cell work on this page reports a result for these. That is an absence of evidence rather than evidence of absence, but it does mean anything you have been told about Folate and one of these did not come from a study cited here.
When this earns a spot
It earns a spot when homocysteine is high and B12 has been checked. MTHFR is context. It does not earn a spot because lowering homocysteine sounded like it should prevent heart attacks. HOPE-2 and NORVIT moved the number and not the events.
Owner stack tier 2
Bloodwork that belongs beside the bottle
Always pair with B12 and MMA when the question is a high homocysteine.
Default retest window: 90 days. If the named marker did not move, stop.
- Folate first can mask B12 deficiency.
- Serum folate is not the same as the pathway working.
Reading the number
If homocysteine did not move, stop. If it moved, do not celebrate an outcome the large trials did not show.
Marker glossary: Homocysteine.
What people typically order
Ask for homocysteine, B12, MMA, and folate. /bloodwork/partners is the collection doorway.
Show full evidence
Overview
Folate is the B vitamin the owner's methylated-B rule uses against homocysteine. The biochemistry works. The outcome story does not, at the scale that matters.
HOPE-2 randomised people with vascular disease to folic acid plus B6 plus B12 and lowered homocysteine. The primary vascular-event endpoint did not improve. NORVIT, in people after a heart attack, also lowered homocysteine and did not help events. Those two papers are why this page will not sell you a methylated stack as cardiology.
Pregnancy neural-tube prevention is a different, established use and belongs to prenatal care, not this longevity stub. Masking B12 deficiency by giving folate first is the practical harm this page exists to prevent.
Mechanism of action
Folate donates one-carbon units. With B12 it remethylates homocysteine to methionine. 5-MTHF is the methylated form sold to people who know their MTHFR genotype. The genotype changes enzyme kinetics. It does not, by itself, write a dose.
Human evidence
The number moves. The large vascular-outcome trials did not give the benefit the observational homocysteine story promised.
- HOPE-2: homocysteine down, primary vascular endpoint not improved.
- NORVIT: same pattern after heart attack, with a harm discussion.
- Pregnancy neural-tube prevention is a separate, clinician-owned use and is not the claim of this stub.
What this does not tell you: These trials are not a claim that folate is useless in deficiency or in pregnancy. They are a claim that lowering homocysteine in vascular patients was not cardiology. Check B12 and MMA before you add folate to a high homocysteine.
The evidence, charted
Fig. 1a · evidence scale
2human studies cited, participant count not stated
participants not stated
No participant total is drawn, because none of the human citations on this page gives one. Read the citations below for what each study measured.
Participant counts are read from the citation lines on this page. Where a line states no number, nothing is counted for it rather than estimated.
Fig. 1b · evidence mix
All 2 citations here are human work.
- Human · given to people2100%
Counted from the citation list on this page, typed as this page types it. It understates any literature larger than the sources we cite, and a review counts once however many studies it covers.
Fig. 2 · evidence over time
Every citation here was published in 2006.
Too few distinct publication years on this page to plot as a timeline. The newest citation on file is from 2006, more than five years ago; the published record may have gone quiet.
Fig. 3 · legal status at a glance
US
Not approved
UK
Not approved
AU
Not approved
CA
Not approved
Not approved in any of the four jurisdictions shown. A jurisdiction's classification is a regulatory fact, not a verdict on the science; see Legal status below for the full text and any notes.
Fig. 4 · dose response
No human dose response curve exists
We draw this figure where the data supports it. For this compound in humans it does not, so the panel stays empty rather than borrowing an animal curve and implying it transfers.
Fig. 5 · molecular identity
- Modality
- Supplement
- Molecular weight
- Not on file
- Half-life
- None on file
- Sequence length
- None on file
No amino acid sequence is on file for Folate, which is expected: a supplement is not built from residues.
Key studies & citations
- Human2006Homocysteine lowering with folic acid and B vitamins in vascular disease.
HOPE-2. Folic acid plus B6 plus B12 lowered homocysteine. The primary composite of death, myocardial infarction, and stroke did not improve.
- Human2006Homocysteine lowering and cardiovascular events after acute myocardial infarction.
NORVIT. After myocardial infarction, B-vitamin homocysteine lowering did not reduce events and raised concern about harm. Same week as HOPE-2.
Frequently asked questions
Has Folate been tested in people?
B vitamins reliably lower homocysteine. HOPE-2 and NORVIT then showed that lowering it did not prevent the vascular events people wanted. MTHFR is context, not a protocol. Check B12 before you add folate. 2 human studies where nobody was given it. 0 people given it across 0 completed trials. 0 found nothing.
What is the Folate dosage?
No human dose established. No published study on this page has given this compound to people and reported a result. 2 human studies where nobody was given it
Is Folate FDA-approved?
Sold as a supplement. Folic acid is also used in licensed prenatal and deficiency medicines. Not approved to prevent heart attacks by lowering homocysteine.
I have an MTHFR variant. Do I need methylfolate?
It is context. The owner's rule still waits on homocysteine, and still wants B12 checked. A variant is not a standing order.
Can I start folate today and test later?
Not if B12 has never been checked. Folate can correct the blood-count picture of B12 deficiency while the nerve problem continues.